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class="post_cover left_radius"><a href="/33040.html" title="SpringBoot入门-2">     <img class="post_bg" data-lazy-src="https://qiniu.codekylin.cn/github/img/img20200824151925.jpg" onerror="this.onerror=null;this.src='/img/404.jpg'" alt="SpringBoot入门-2"></a></div><div class="recent-post-info"><a class="article-title" href="/33040.html" title="SpringBoot入门-2">SpringBoot入门-2</a><div class="article-meta-wrap"><span class="post-meta-date"><i class="far fa-calendar-alt"></i><span class="article-meta-label">发表于</span><time datetime="2020-01-05T09:06:23.000Z" title="发表于 2020-01-05 17:06:23">2020-01-05</time></span><span class="article-meta"><span class="article-meta__separator">|</span><i class="fas fa-inbox"></i><a class="article-meta__categories" href="/categories/SpringBoot/">SpringBoot</a><i class="fas fa-angle-right"></i><a class="article-meta__categories" href="/categories/SpringBoot/%E5%85%A5%E9%97%A8/">入门</a></span><span class="article-meta"><span class="article-meta__separator">|</span><i class="fas fa-comments"></i><a href="/33040.html#post-comment" itemprop="discussionUrl"><span class="valine-comment-count" data-xid="/33040.html" itemprop="commentCount"></span></a><span class="article-meta-label"> 条评论</span></span></div><div class="content">使用Spring Initializer快速创建Spring Boot项目1、IDEA：使用 Spring Initializer快速创建项目IDE都支持使用Spring的项目创建向导快速创建一个Spring Boot项目
选择我们需要的模块；向导会联网创建Spring Boot项目




默认生成的Spring Boot项目；

主程序已经生成好了，我们只需要我们自己的逻辑

resources文件夹中目录结构

static：保存所有的静态资源。js css  images
templates：保存所有的模板页面；（Spring Boot默认jar包使用嵌入式的Tomcat，默认不支持JSP页面）；可以使用模板引擎（freemarker、thymeleaf）
application.properties：Spring Boot应用的配置文件，可以修改一些默认设置




2、STS使用 Spring Starter Project快速创建项目　　Spring Tool Suite是一个基于Eclipse的开发环境，可以自定义用于开发Spring应用程序。它提供了一个随时可用的环境 ...</div></div></div><div class="recent-post-item"><div class="post_cover right_radius"><a href="/32848.html" title="SpringBoot入门-1">     <img class="post_bg" data-lazy-src="https://qiniu.codekylin.cn/github/img/img/wallhaven-eorjzk.png" onerror="this.onerror=null;this.src='/img/404.jpg'" alt="SpringBoot入门-1"></a></div><div class="recent-post-info"><a class="article-title" href="/32848.html" title="SpringBoot入门-1">SpringBoot入门-1</a><div class="article-meta-wrap"><span class="post-meta-date"><i class="far fa-calendar-alt"></i><span class="article-meta-label">发表于</span><time datetime="2020-01-05T08:34:19.000Z" title="发表于 2020-01-05 16:34:19">2020-01-05</time></span><span class="article-meta"><span class="article-meta__separator">|</span><i class="fas fa-inbox"></i><a class="article-meta__categories" href="/categories/SpringBoot/">SpringBoot</a><i class="fas fa-angle-right"></i><a class="article-meta__categories" href="/categories/SpringBoot/%E5%85%A5%E9%97%A8/">入门</a></span><span class="article-meta"><span class="article-meta__separator">|</span><i class="fas fa-comments"></i><a href="/32848.html#post-comment" itemprop="discussionUrl"><span class="valine-comment-count" data-xid="/32848.html" itemprop="commentCount"></span></a><span class="article-meta-label"> 条评论</span></span></div><div class="content">一、Spring Boot 入门1、Spring Boot 简介
简化Spring应用开发的一个框架；
整个Spring技术栈的一个大整合；
J2EE开发的一站式解决方案；

2、微服务2014，martin fowler
微服务：架构风格（服务微化）
一个应用应该是一组小型服务；可以通过HTTP的方式进行互通；
单体应用：ALL IN ONE
微服务：每一个功能元素最终都是一个可独立替换和独立升级的软件单元；
详细参照微服务文档
3、环境准备环境约束

jdk1.8：Spring Boot 推荐jdk1.7及以上；java version “1.8.0_112”

maven3.x：maven 3.3以上版本；Apache Maven 3.3.9



IntelliJIDEA2017：IntelliJ IDEA 2017.2.2 x64、STS

SpringBoot 1.5.9.RELEASE：1.5.9；


统一环境；
1、MAVEN设置；给maven 的settings.xml配置文件的profiles标签添加
123456789101112&lt;profile&gt;  ...</div></div></div><div class="recent-post-item"><div class="post_cover left_radius"><a href="/18966.html" title="错误问题记录-1">     <img class="post_bg" data-lazy-src="https://qiniu.codekylin.cn/github/img/img/wallhaven-492lkw.png" onerror="this.onerror=null;this.src='/img/404.jpg'" alt="错误问题记录-1"></a></div><div class="recent-post-info"><a class="article-title" href="/18966.html" title="错误问题记录-1">错误问题记录-1</a><div class="article-meta-wrap"><span class="post-meta-date"><i class="far fa-calendar-alt"></i><span class="article-meta-label">发表于</span><time datetime="2019-12-30T01:56:23.000Z" title="发表于 2019-12-30 09:56:23">2019-12-30</time></span><span class="article-meta"><span class="article-meta__separator">|</span><i class="fas fa-inbox"></i><a class="article-meta__categories" href="/categories/%E9%94%99%E8%AF%AF%E9%97%AE%E9%A2%98%E8%AE%B0%E5%BD%95/">错误问题记录</a></span><span class="article-meta"><span class="article-meta__separator">|</span><i class="fas fa-comments"></i><a href="/18966.html#post-comment" itemprop="discussionUrl"><span class="valine-comment-count" data-xid="/18966.html" itemprop="commentCount"></span></a><span class="article-meta-label"> 条评论</span></span></div><div class="content">Tomcat的8080端口占用问题Tomcat的8080端口被占用，控制台输入netstat -ano | findstr “8080”找到对应的pid值，通过任务管理器找到相应的程序，发现是Oracle-TNSLSNR.EXE占用8080端口号的问题。
解决方法之一：改变TNSLSNR.exe占用的端口。

运行cmd,输入sqlplus / as sysdba； 
输入exec dbms_xdb.sethttpport(8088)。（其中8088为更改后的端口）

解决方法之二：修改Tomcat配置文件

进入tomcat的安装路径，进入到conf文件中找到server.xml。

找到Connector标签，protocol属性为’’HTTP/1.1’’。修改其中的port属性值
123&lt;Connector port=&quot;80&quot; protocol=&quot;HTTP/1.1&quot;           connectionTimeout=&quot;20000&quot;           redirectPort=&quot;8443&quot; ...</div></div></div><div class="recent-post-item"><div class="post_cover right_radius"><a href="/48603.html" title="SpringMVC学习-8">     <img class="post_bg" data-lazy-src="https://qiniu.codekylin.cn/github/images/20200418114518.png" onerror="this.onerror=null;this.src='/img/404.jpg'" alt="SpringMVC学习-8"></a></div><div class="recent-post-info"><a class="article-title" href="/48603.html" title="SpringMVC学习-8">SpringMVC学习-8</a><div class="article-meta-wrap"><span class="post-meta-date"><i class="far fa-calendar-alt"></i><span class="article-meta-label">发表于</span><time datetime="2019-12-24T09:12:21.000Z" title="发表于 2019-12-24 17:12:21">2019-12-24</time></span><span class="article-meta"><span class="article-meta__separator">|</span><i class="fas fa-inbox"></i><a class="article-meta__categories" href="/categories/SSM/">SSM</a><i class="fas fa-angle-right"></i><a class="article-meta__categories" href="/categories/SSM/SpringMVC/">SpringMVC</a></span><span class="article-meta"><span class="article-meta__separator">|</span><i class="fas fa-comments"></i><a href="/48603.html#post-comment" itemprop="discussionUrl"><span class="valine-comment-count" data-xid="/48603.html" itemprop="commentCount"></span></a><span class="article-meta-label"> 条评论</span></span></div><div class="content">Spring MVC处理异常有3种方式
使用Spring MVC提供的简单异常处理器SimpleMappingExceptionResolver； 
实现Spring的异常处理接口HandlerExceptionResolver 自定义自己的异常处理器； 
使用@ExceptionHandler注解实现异常处理； 
Controller调用service，service调用dao，异常都是向上抛出的，最终有DispatcherServlet找异常处理器进 行异常的处理


使用Spring MVC提供的简单异常处理器SimpleMappingExceptionResolver在SpringMVC配置文件中添加配置


123456789101112131415&lt;bean class=&quot;org.springframework.web.servlet.handler.SimpleMappingExceptionResolver&quot;&gt;      &lt;!-- 定义默认的异常处理页面，当该异常类型的注册时使用 --&gt;      &lt;property n ...</div></div></div><div class="recent-post-item"><div class="post_cover left_radius"><a href="/47515.html" title="SpringMVC学习-7">     <img class="post_bg" data-lazy-src="https://qiniu.codekylin.cn/github/img/img/wallhaven-oxm7vp.jpg" onerror="this.onerror=null;this.src='/img/404.jpg'" alt="SpringMVC学习-7"></a></div><div class="recent-post-info"><a class="article-title" href="/47515.html" title="SpringMVC学习-7">SpringMVC学习-7</a><div class="article-meta-wrap"><span class="post-meta-date"><i class="far fa-calendar-alt"></i><span class="article-meta-label">发表于</span><time datetime="2019-12-23T12:47:33.000Z" title="发表于 2019-12-23 20:47:33">2019-12-23</time></span><span class="article-meta"><span class="article-meta__separator">|</span><i class="fas fa-inbox"></i><a class="article-meta__categories" href="/categories/SSM/">SSM</a><i class="fas fa-angle-right"></i><a class="article-meta__categories" href="/categories/SSM/SpringMVC/">SpringMVC</a></span><span class="article-meta"><span class="article-meta__separator">|</span><i class="fas fa-comments"></i><a href="/47515.html#post-comment" itemprop="discussionUrl"><span class="valine-comment-count" data-xid="/47515.html" itemprop="commentCount"></span></a><span class="article-meta-label"> 条评论</span></span></div><div class="content">拦截器的概述
SpringMVC框架中的拦截器用于对处理器进行预处理和后处理的技术。 
可以定义拦截器链(栈)，连接器链就是将拦截器按着一定的顺序结成一条链，在访问被拦截的方法时，拦截器链中的拦截器会按着定义的顺序执行。 
拦截器和过滤器的功能比较类似，有区别 
过滤器是Servlet规范的一部分，任何框架都可以使用过滤器技术。 
拦截器是SpringMVC框架独有的。
过滤器配置了/*，可以拦截任何资源。 
拦截器只会对控制器中的方法进行拦截。


拦截器也是AOP思想的一种实现方式 
发送请求时被拦截器拦截,在控制器的前后添加额外功能.
跟 AOP 区分开.AOP 在特定方法前后扩充(对 ServiceImpl)
拦截器,请求的拦截.针对点是控制器方法.(对 Controller)


想要自定义拦截器，需要实现HandlerInterceptor接口。 

实现自定义拦截器的步骤
新建controller并实现HandlerInterceptor重写方法

HandlerInterceptor接口中的方法 



方法名
执行顺序
页面跳转
返回值



preHandle
co ...</div></div></div><div class="recent-post-item"><div class="post_cover right_radius"><a href="/31066.html" title="SpringMVC学习-6">     <img class="post_bg" data-lazy-src="https://qiniu.codekylin.cn/github/img/img/博客封面17.png" onerror="this.onerror=null;this.src='/img/404.jpg'" alt="SpringMVC学习-6"></a></div><div class="recent-post-info"><a class="article-title" href="/31066.html" title="SpringMVC学习-6">SpringMVC学习-6</a><div class="article-meta-wrap"><span class="post-meta-date"><i class="far fa-calendar-alt"></i><span class="article-meta-label">发表于</span><time datetime="2019-12-23T06:28:30.000Z" title="发表于 2019-12-23 14:28:30">2019-12-23</time></span><span class="article-meta"><span class="article-meta__separator">|</span><i class="fas fa-inbox"></i><a class="article-meta__categories" href="/categories/SSM/">SSM</a><i class="fas fa-angle-right"></i><a class="article-meta__categories" href="/categories/SSM/SpringMVC/">SpringMVC</a></span><span class="article-meta"><span class="article-meta__separator">|</span><i class="fas fa-comments"></i><a href="/31066.html#post-comment" itemprop="discussionUrl"><span class="valine-comment-count" data-xid="/31066.html" itemprop="commentCount"></span></a><span class="article-meta-label"> 条评论</span></span></div><div class="content">文件下载
访问资源时响应如果没有设置 Content-Disposition,浏览器默认按照 inline 值进行处理。inline 能显示就显示,不能显示就下载.

只需要修改相应头中 Context-Disposition=”attachment;filename=文件名”

attachment 下载,以附件形式下载.

filename=值就是下载时显示的下载文件名
1res.setHeader(&quot;Content-Disposition&quot;, &quot;attachment;filename=文件名&quot;);



通过apache提供的jar包来实现


实现步骤
导入jar包


在 jsp 中添加超链接,设置要下载文件。在 springmvc 中放行静态资源files文件夹



编写控制器方法 




123456789101112&lt;%@ page language=&quot;java&quot; contentType=&quot;text/html; charset=UTF-8&quot;         pageEncoding ...</div></div></div><div class="recent-post-item"><div class="post_cover left_radius"><a href="/30746.html" title="SpringMVC学习-5">     <img class="post_bg" data-lazy-src="https://qiniu.codekylin.cn/github/img/img/博客封面20.png" onerror="this.onerror=null;this.src='/img/404.jpg'" alt="SpringMVC学习-5"></a></div><div class="recent-post-info"><a class="article-title" href="/30746.html" title="SpringMVC学习-5">SpringMVC学习-5</a><div class="article-meta-wrap"><span class="post-meta-date"><i class="far fa-calendar-alt"></i><span class="article-meta-label">发表于</span><time datetime="2019-12-23T02:24:05.000Z" title="发表于 2019-12-23 10:24:05">2019-12-23</time></span><span class="article-meta"><span class="article-meta__separator">|</span><i class="fas fa-inbox"></i><a class="article-meta__categories" href="/categories/SSM/">SSM</a><i class="fas fa-angle-right"></i><a class="article-meta__categories" href="/categories/SSM/SpringMVC/">SpringMVC</a></span><span class="article-meta"><span class="article-meta__separator">|</span><i class="fas fa-comments"></i><a href="/30746.html#post-comment" itemprop="discussionUrl"><span class="valine-comment-count" data-xid="/30746.html" itemprop="commentCount"></span></a><span class="article-meta-label"> 条评论</span></span></div><div class="content">JSP 九大内置对象和四大作用域复习JSP九大内置对象


名称
类型
含义
获取方式



request
HttpServletRequset
封装所有请求信息
方法参数


response
HttpServletResponse
封装所有相应信息
方法参数


session
HttpSession
封装所有会话信息
req.getSession()


application
ServletContext
所有信息
getServletContext(); requset.getServletContext;


out
PrintWriter
输出对象
response.getWriter()


exception
Exception
异常对象



page
Object
当前页面对象



pageContext
pageContext
获取其他信息



config
ServletConfig
配置信息



四大作用域
page
在当前页面不会重新实例化。作用域当前页面

request  在一次请求中同一个对象,下次请求重新实例化一个request 对象.

 ...</div></div></div><div class="recent-post-item"><div class="post_cover right_radius"><a href="/47323.html" title="SpringMVC学习-4">     <img class="post_bg" data-lazy-src="https://qiniu.codekylin.cn/github/img/img/wallhaven-dgzqkl.jpg" onerror="this.onerror=null;this.src='/img/404.jpg'" alt="SpringMVC学习-4"></a></div><div class="recent-post-info"><a class="article-title" href="/47323.html" title="SpringMVC学习-4">SpringMVC学习-4</a><div class="article-meta-wrap"><span class="post-meta-date"><i class="far fa-calendar-alt"></i><span class="article-meta-label">发表于</span><time datetime="2019-12-22T01:31:57.000Z" title="发表于 2019-12-22 09:31:57">2019-12-22</time></span><span class="article-meta"><span class="article-meta__separator">|</span><i class="fas fa-inbox"></i><a class="article-meta__categories" href="/categories/SSM/">SSM</a><i class="fas fa-angle-right"></i><a class="article-meta__categories" href="/categories/SSM/SpringMVC/">SpringMVC</a></span><span class="article-meta"><span class="article-meta__separator">|</span><i class="fas fa-comments"></i><a href="/47323.html#post-comment" itemprop="discussionUrl"><span class="valine-comment-count" data-xid="/47323.html" itemprop="commentCount"></span></a><span class="article-meta-label"> 条评论</span></span></div><div class="content">SpringMVC参数传递基本数据类型参数
默认保证参数名称和请求中传递的参数名相同 





如果请求参数名和方法参数名不对应使用@RequestParam注解中的value值进行匹配赋值（都适用）





如果方法参数是基本数据类型(不是封装类)可以通过@RequestParam中的defaultValue值设置参数默认值，可以防止没有参数时 500错误





通过@RequestParam注解中的required的强制要求必须某个参数值不能为空 




对象数据类型
请求参数为对象时，前台传递的参数名与对象的属性名一致，且生成get与set方法






请求参数为对象.属性格式





集合对象类型参数



多个同名参数复选框传递的参数就是多个同名参数



restful 传值方式
在@RequestMapping 中一定要和请求格式对应 ：/控制器名/{名称}/{名称}

{名称} 中名称可以自定义名称

@PathVariable 获取@RequestMapping 中内容,默认按照方法参数名称去寻找. 





跳转方式SpringMVC中默认的跳转方 ...</div></div></div><div class="recent-post-item"><div class="post_cover left_radius"><a href="/31386.html" title="SpringMVC学习-3">     <img class="post_bg" data-lazy-src="https://qiniu.codekylin.cn/github/img/img/wallhaven-0pvrpm.jpg" onerror="this.onerror=null;this.src='/img/404.jpg'" alt="SpringMVC学习-3"></a></div><div class="recent-post-info"><a class="article-title" href="/31386.html" title="SpringMVC学习-3">SpringMVC学习-3</a><div class="article-meta-wrap"><span class="post-meta-date"><i class="far fa-calendar-alt"></i><span class="article-meta-label">发表于</span><time datetime="2019-12-21T10:18:19.000Z" title="发表于 2019-12-21 18:18:19">2019-12-21</time></span><span class="article-meta"><span class="article-meta__separator">|</span><i class="fas fa-inbox"></i><a class="article-meta__categories" href="/categories/SSM/">SSM</a><i class="fas fa-angle-right"></i><a class="article-meta__categories" href="/categories/SSM/SpringMVC/">SpringMVC</a></span><span class="article-meta"><span class="article-meta__separator">|</span><i class="fas fa-comments"></i><a href="/31386.html#post-comment" itemprop="discussionUrl"><span class="valine-comment-count" data-xid="/31386.html" itemprop="commentCount"></span></a><span class="article-meta-label"> 条评论</span></span></div><div class="content">SpringMVC环境搭建
导入jar包



配置web.xml文件


配置SpringMVC配置文件


编写控制器Controller



字符编码过滤器
filter-class：org.springframework.web.filter.CharacterEncodingFilter
url-pattern配置为/*从而拦截一切请求，对其进行设置字符编码
设置初始化参数encoding的值，配置字符编码格式

视图解析器
SpringMVC 会提供默认视图解析器.
程序员自定义视图解析器 prefix-前缀 suffix-后缀
如果希望不执行自定义视图解析器,在方法返回值前面添加forward:或 redirect:

1234567891011121314151617181920212223&lt;?xml version=&quot;1.0&quot; encoding=&quot;UTF-8&quot;?&gt;&lt;web-app xmlns=&quot;http://xmlns.jcp.org/xml/ns/javaee&quot;         xmln ...</div></div></div><div class="recent-post-item"><div class="post_cover right_radius"><a href="/47707.html" title="SpringMVC学习-2">     <img class="post_bg" data-lazy-src="https://qiniu.codekylin.cn/github/img/img/博客封面14.png" onerror="this.onerror=null;this.src='/img/404.jpg'" alt="SpringMVC学习-2"></a></div><div class="recent-post-info"><a class="article-title" href="/47707.html" title="SpringMVC学习-2">SpringMVC学习-2</a><div class="article-meta-wrap"><span class="post-meta-date"><i class="far fa-calendar-alt"></i><span class="article-meta-label">发表于</span><time datetime="2019-12-21T07:17:01.000Z" title="发表于 2019-12-21 15:17:01">2019-12-21</time></span><span class="article-meta"><span class="article-meta__separator">|</span><i class="fas fa-inbox"></i><a class="article-meta__categories" href="/categories/SSM/">SSM</a><i class="fas fa-angle-right"></i><a class="article-meta__categories" href="/categories/SSM/SpringMVC/">SpringMVC</a></span><span class="article-meta"><span class="article-meta__separator">|</span><i class="fas fa-comments"></i><a href="/47707.html#post-comment" itemprop="discussionUrl"><span class="valine-comment-count" data-xid="/47707.html" itemprop="commentCount"></span></a><span class="article-meta-label"> 条评论</span></span></div><div class="content">
在Spring整体框架的核心概念中，容器的核心思想是管理Bean的整个生命周期。但在一个项目中，Spring容器往往不止一个，最常见的场景就是在一个项目中引入Spring和SpringMVC这两个框架，其本质就是两个容器：Spring是根容器，SpringMVC是其子容器。关于这两个容器的创建、联系及区别也正是本文所关注的问题。

Spring容器、SpringMVC容器与ServletContext之间的关系Spring的启动过程其实就是其Spring IOC容器的启动过程。特别地，对于web程序而言，IOC容器启动过程即是建立上下文的过程。
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